如何为 Play Java 项目的 Eclipse IDE 创建项目设置

Question

I am using Eclipse 4.5 (Mars) and Play framework 2.4. I created a Java project using the template id play-java . Then I created Eclipse settings for the project using the command eclipse at activator console. Somehow, the .project file got changed and now Eclipse recognizes Java project as Scala project. This means I get no Java help from Eclipse. This is the content of the .project file in the root project folder:

<projectDescription>
  <name>YMLPushNotificationService</name>
  <buildSpec>
    <buildCommand>
      <name>org.scala-ide.sdt.core.scalabuilder</name>
    </buildCommand>
  </buildSpec>
  <natures>
    <nature>org.scala-ide.sdt.core.scalanature</nature>
    <nature>org.eclipse.jdt.core.javanature</nature>
  </natures>
  <linkedResources> </linkedResources>
</projectDescription>

If I manually edit the file and replace the line

<name>org.scala-ide.sdt.core.scalabuilder</name>

with

<name>org.eclipse.jdt.core.javabuilder</name>

and run the eclipse command from activator console, the file gets overwritten to its previous state. How do I make eclipse recognize the project as Java project?

Answer 1

In your project/plugins.sbt you need a line with:

addSbtPlugin("com.typesafe.sbteclipse" % "sbteclipse-plugin" % "4.0.0")

and in your build.sbt the following lines:

import com.typesafe.sbteclipse.core.EclipsePlugin.EclipseKeys

EclipseKeys.projectFlavor := EclipseProjectFlavor.Java           // Java project. Don't expect Scala IDE
EclipseKeys.createSrc := EclipseCreateSrc.ValueSet(EclipseCreateSrc.ManagedClasses, EclipseCreateSrc.ManagedResources)  // Use .class files instead of generated .scala files for views and routes